1. Classify the substances according to the strongest solute-solvent interaction
ID: 711785 • Letter: 1
Question
1. Classify the substances according to the strongest solute-solvent interaction that will occur between the given substances and water during dissolution. Classify CuCl2, CuSO4, HF, C2H5OH as ion- dipole forces, hydrogen bonding, dipole-dipole forces, london dispersion factors
2.
Five different substances are given to you to be dissolved in water. Which substances are most likely to undergo dissolution in water?
Check all that apply.
ethanol, CH3CH2OH
3.
Calculate the mass percent of a solution that is prepared by adding 31.0 g of NaOH to 359 g of H2O.
Express your answer numerically.
4.
Calculate the mass/volume percent of a NaCl solution in which 138 g of NaCl is dissolved in enough water to give a total volume of 3.93 L .
Express your answer numerically.
benzene, C6H6 potassium bromide, KBr sodium iodide, NaI pentane, C5H12ethanol, CH3CH2OH
3.
Calculate the mass percent of a solution that is prepared by adding 31.0 g of NaOH to 359 g of H2O.
Express your answer numerically.
4.
Calculate the mass/volume percent of a NaCl solution in which 138 g of NaCl is dissolved in enough water to give a total volume of 3.93 L .
Express your answer numerically.
Explanation / Answer
1)
CuCl2 --------- ion- dipole forces
CuSO4 --------- ion- dipole forces
HF ----------- hydrogen bonding , dipole - dipole
C2H5OH -------- hydrogen bonding , dipole - dipole
2)
potassium bromide, KBr
sodium iodide, NaI
ethanol, CH3CH2OH
these 3 are dissolving in water and give ions.
KBr -------- K+ , Br-
NaI ----- Na+ , I-
in ethanol hydrogen bonding is there. so it can form hydrogen bond with water. so it can dissolve.
3)
mass of NaOH = 31.0 g
mass of water = 359 g
mass of solution = 31 + 359 = 390 g
mass % = (31 / 390 ) x 100
= 7.95 %
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